Plant Services - July 2008 - (Page 23)

TECHNOLOGY TOOLBOX Diaphragm Seal Decisions Smart ways to keep pressure at bay Weissner says. “We are seeing a lot of growth in the aciaphragm seals isolate pressure-measuring instruceptance of the all-welded approach because it reduces shutments from the process media. Choosing the right downs, improves safety and controls emissions.” A flushing diaphragm seal means you must consider temperaport helps remove residue to prevent damage and clogging. ture extremes and whether the media is corrosive, viscous, Pulp and paper: The manufacture of these products intoxic, abrasive or contains suspended solids. The fill fluid volves viscous, aggressive and hardening media. PI Commust be compatible with the process fluid in the event of ponents’ flush diaphragm seal won’t allow debris to plug the a diaphragm rupture. You need to consider the transmitter impulse lines, so the measurement remains accurate. The sensor range, mounting position, regulatory requirements company developed a super-duplex diaphragm material to and other criteria. Here are some examples of the ways prohandle black liquor applications. cess applications influence diaphragm seal Wika’s pulp and paper units meet the indusspecifications, and how software tools simtry’s seal specification and process-connection plify the selection process. Breaks in the requirements. An optional Wikaramic coating Sanitary applications: Some industries are traditional can be applied for protection against scouring subject to stringent government and industry threaded and premature diaphragm wear. sanitary standards. Sanitary diaphragm seals Nuclear power: In this industry, safety, eliminate dead spaces, thereby preventing bacgauge-to-seal reliability, stringent design and manufacturterial growth and contamination in the conconnection can ing quality control are foremost concerns. The nection. Wika’s Inline seals, mounted directly compromise Model 1159 remote diaphragm seal by Roseinto process lines, make them well suited for readings or lead mount Nuclear Instruments is a threaded resuch applications. The self-draining design simplifies cleaning. “The sanitary Inline dia- to system failure. mote diaphragm seal that has been tested to IEEE’s qualifications. Combined with Rosephragm seal is installed between two flanges, mount’s nuclear-grade pressure transmitters, becoming an integral part of the pipeline. It it supports boiling water and pressurized water reactors. replaces the conventional T-piece,” says Raimund Weissner, Seal software: With so much to consider and process Wika technical director of diaphragm seals. reliability at stake, some seal manufacturers offer selection Clamped sanitary diaphragm seals that compress the gassoftware. Rosemount’s Instrument Toolkit eliminates transket can impinge on the active pressure-sensing area of the mitter and seal combos that don’t meet your requirements. diaphragm. PI Components virtually eliminates the “clamp The software factors in conditions that affect performance to effect” with its improved-finish sanitary seals and patented calculate the transmitter/seal performance. It also produces attachment technology. reports, installation drawings and specification sheets. Biodiesel and ethanol: Biofuel processing is subject to BAsecal, Badotherm’s seal program, lets users select the the same harsh environmental conditions, mechanical viseal/transmitter combination for the needs of the applicabration and process pulsation found in oil and gas processtion. The Windows-based package aligns Badotherm seals ing. Breaks in the threaded gauge-to-seal connection can with well-known industrial transmitters. It then calculates compromise readings or lead to system failure. the performance based on the application data. Wika’s all-welded system integrates the process gauge and diaphragm seal into a single assembly, and each connection and leak path is welded. “[The] system is leak-free, tamperE-mail Contributing Editor Sheila Kennedy, managing director of resistant and durable – a true dual-containment system,” Additive Communications, at Sheila@addcomm.com. For more information, see: www.wika.com www.picseals.com www.emersonprocess.com/rosemount July 2008 D www.badotherm.com www.ashcroft.com www.plantservices.com/articles/2007/075.html www.PLANTSERVICES.com 23 http://www.wika.com http://www.badotherm.com http://www.picseals.com http://www.ashcroft.com http://www.emersonprocess.com/rosemount http://www.plantservices.com/articles/2007/075.html http://www.PLANTSERVICES.com

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Plant Services - July 2008 Contents From the Editor Letters The PS Files Up and Running Crisis Corner Asset Manager Technology Toolbox Cover Story Compressors Power Transmission Flooring Web Hunter In the Trenches Product Picks Classifieds Energy Expert

Plant Services - July 2008

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